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Table 1 Demographic information on patients with AAV in 2015 in China

From: The frequency of ANCA-associated vasculitis in a national database of hospitalized patients in China

  AAV GPA MPA EGPA
Number 4440 385 396 223
Age (years) 60.0 ± 15.6 50.7 ± 15.6 62.3 ± 17.2 50.3 ± 15.6
Age group, %
 0–17 1.3 1.6 3.5 3.1
 18–30 5.0 11.4 2.8 9.4
 31–40 4.8 10.4 2.8 11.2
 41–50 11.8 23.9 7.4 20.2
 51–60 20.6 24.4 17.4 27.8
 61–70 29.9 17.1 34.8 21.5
  > 80 26.6 11.2 31.3 6.6
Male, % 46.4(45.0,47.9) 49.9(44.9,54.9) 48.5(43.6,53.4) 52.5(45.9,59.0)
Occupation, %
 Professional or semi-professional 9.1 (8.2,10.0) 14.7 (10.9,18.4) 8.5 (5.6,11.4) 16.1 (11.1,21.1)
 Worker 2.9 (2.4,3.4) 2.9 (1.1,4.6) 2.5 (0.9,4.2) 3.9 (1.3,6.6)
 Farmer 25.7 (24.3,27.0) 22.4 (18.0,26.8) 25.4 (20.9,30.0) 22.0 (16.3,27.6)
 Retired 20.4 (19.1,21.6) 12.9 (9.4,16.5) 24.3 (19.8,28.8) 15.6 (10.6,20.6)
 Unemployed 7.2 (6.4,8.0) 6.9 (4.2,9.6) 7.9 (5.1,10.7) 4.4 (1.6,7.2)
 Others 34.7 (33.3,36.2) 40.2 (35.1,45.4) 31.4 (26.5,36.2) 38.0 (31.4,44.7)
Medical insurance
 Basic Medical Insurance 44.4 (43.0,45.9) 38.2 (33.3,43.0) 44.4 (39.6,49.3) 45.7 (39.2,52.3)
 New Rural Co-operative Medical Care 24.1 (22.9,25.4) 24.7 (20.4,29.0) 21.7 (17.7,25.8) 25.1 (19.4,30.8)
 Other insurance 16.0 (14.9,17.1) 16.1 (12.4,19.8) 21.5 (17.4,25.5) 17.9 (12.9,23.0)
 No insurance 15.4 (14.4,16.5) 21.0 (17.0,25.1) 12.4 (9.1,15.6) 11.2 (7.1,15.4)
Admission place
 Emergency 12.6 (11.6,13.6) 15.0 (11.3,18.7) 11.5 (8.2,14.7) 16.4 (11.5,21.4)
Routine 79.9 (78.7,81.1) 76.7 (72.3,81.0) 83.1 (79.2,86.9) 77 (71.3,82.6)
 Other 7.5 (6.7,8.3) 8.3 (5.5,11.2) 5.5 (3.1,7.8) 6.6 (3.2,9.9)
ICU stay, % 2.2 (1.7,2.6) 0.3 (0,0.8) 3.5 (1.7,5.4) 0.4 (0,1.3)
Costs (10,000 RMB), median (Q1–Q3) 13 (7–23) 10 (6–19) 14 (8–24) 11 (7–18)
Length of stay (days), median (Q1–Q3) 12 (8–19) 12 (7–18) 13 (8–21) 12 (8–16)
In-hospital mortality, % 1.8 (1.4,2.2) 1.3 (0.2,2.4) 2.8 (1.2,4.4) 0.4 (0,1.3)
  1. Abbreviations: AAV anti-neutrophil cytoplasmic autoantibody associated vasculitis, GPA granulomatosis with polyangiitis, MPA microscopic polyangiitis, EGPA eosinophilic granulomatosis with polyangiitis, ICU intensive care unit, RMB Renminbi, which is Chinese currency.